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need DNW for capacitor in ADC?

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iexplorer

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noise isoltion dnw p+

Need I use some DNW to isolation capacitor to avoid noise ? I use MIM cap ,I thought that the caps are really far from sub,but I saw a lot of people use M1-Pactive to isolate ,why?
 

leo_o2

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I think DNW will have better substrate noise isolation than P+ active.
 

iexplorer

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but how does it affect MIM cap?
 

leo_o2

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It is influenced by cap coupling.
 

Fady Atef

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leo_o2 said:
I think DNW will have better substrate noise isolation than P+ active.

But DNW meaning that he will use additional mask , and this is not an option at all cases , so in my opinion the use of DNW or P+active will depends on the application
 

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